linux-kernel - Re: [PATCH 0/3] mm: cma: /proc/cmainfo

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Date:	Fri, 2 Jan 2015 06:11:11 +0100
From:	Pavel Machek <pavel@....cz>
To:	Minchan Kim <minchan@...nel.org>
Cc:	"Stefan I. Strogin" <s.strogin@...tner.samsung.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	aneesh.kumar@...ux.vnet.ibm.com,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>,
	Pintu Kumar <pintu.k@...sung.com>,
	Weijie Yang <weijie.yang@...sung.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	SeongJae Park <sj38.park@...il.com>,
	Hui Zhu <zhuhui@...omi.com>,
	Dyasly Sergey <s.dyasly@...sung.com>,
	Vyacheslav Tyrtov <v.tyrtov@...sung.com>
Subject: Re: [PATCH 0/3] mm: cma: /proc/cmainfo

On Mon 2014-12-29 11:36:39, Minchan Kim wrote:
> Hello,
> 
> On Fri, Dec 26, 2014 at 05:39:01PM +0300, Stefan I. Strogin wrote:
> > Hello all,
> > 
> > Here is a patch set that adds /proc/cmainfo.
> > 
> > When compiled with CONFIG_CMA_DEBUG /proc/cmainfo will contain information
> > about about total, used, maximum free contiguous chunk and all currently
> > allocated contiguous buffers in CMA regions. The information about allocated
> > CMA buffers includes pid, comm, allocation latency and stacktrace at the
> > moment of allocation.

We should not add new non-process related files in
/proc. So... NAK. Should this go to debugfs instead?

> It just says what you are doing but you didn't say why we need it.
> I can guess but clear description(ie, the problem what you want to
> solve with this patchset) would help others to review, for instance,
> why we need latency, why we need callstack, why we need new wheel
> rather than ftrace and so on.
> 
> Thanks.
> 
> > 
> > Example:
> > 
> > # cat /proc/cmainfo 
> > CMARegion stat:    65536 kB total,      248 kB used,    65216 kB max contiguous chunk


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